A nano-silica grafted organic functional polymer bisamide insecticide slow-release agent and preparation method thereof

A technology of nano-silica and functional polymers, applied in the field of new formulations of pesticides, can solve problems such as poor dispersion, lack of ability to control the release of active ingredients, and difficulty in exerting drug effects, so as to achieve low cost and increase the utilization rate of pesticides , the effect of reducing the frequency of spraying

Active Publication Date: 2019-02-05
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These dosage forms have limitations such as the use of a large number of organic solvents, dust drift, and poor dispersion, and do not have the ability to control the release of active ingredients, resulting in rapid hydrolysis, photolysis or microbial metabolism of pesticides in the target body or in the environment near the target, making them When the concentration drops below the effective concentration, it is difficult to exert the drug effect

Method used

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  • A nano-silica grafted organic functional polymer bisamide insecticide slow-release agent and preparation method thereof
  • A nano-silica grafted organic functional polymer bisamide insecticide slow-release agent and preparation method thereof
  • A nano-silica grafted organic functional polymer bisamide insecticide slow-release agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 0.5g nano-calcium carbonate, 0.01g cetyltrimethylammonium bromide (CTAB) and 94mL ethanol to a 250mL flask, add 23.5mL 27wt% ammonia water after ultrasonic dispersion for half an hour, start stirring, and control the reaction in a water bath At a temperature of 25°C, add 0.02mol ethyl orthosilicate to the above reaction system, and react for 48 hours;

[0041] (2) adding excessive dilute hydrochloric acid, removing the nano-calcium carbonate template, centrifuging to remove the supernatant and washing the obtained solid, repeating three times, to obtain hollow nano-silica A;

[0042] (3) Add 100mL of water and ethanol (V / V=1:1) and A obtained in step (2) to a three-necked flask. After ultrasonic dispersion for half an hour, control the reaction temperature at 50°C, and dropwise add 0.02mol (CH 3 CH 2 O) 3 Si(CH 2 ) 3 NH 2 , reacted for 2 hours, centrifuged to remove the supernatant and washed the obtained solid, and repeated three times to obtain amino-modi...

Embodiment 2

[0050] (1) Add 1.0g of nano-calcium carbonate, 1.0g of cetyltrimethylammonium bromide (CTAB) and 97.5mL of ethanol to a 250mL flask, add 19.5mL of 27wt% ammonia water after ultrasonic dispersion for half an hour, start stirring, and control the water bath The reaction temperature is 30°C, add 0.02mol tetraethyl orthosilicate to the above reaction system, and react for 40 hours;

[0051] (2) adding excessive dilute hydrochloric acid, removing the nano-calcium carbonate template, centrifuging to remove the supernatant and washing the obtained solid, repeating three times, to obtain hollow nano-silica A;

[0052] (3) Add 100mL of water and ethanol (V / V=1:1), A obtained in step (2) to the three-necked flask, ultrasonically disperse for half an hour and control the reaction temperature at 25°C, add dropwise 0.04mol (CH 3 O) 3 Si(CH 2 ) 4 NH 2 , reacted for 2 hours, centrifuged to remove the supernatant and washed the obtained solid, and repeated three times to obtain amino-modi...

Embodiment 3

[0059] (1) Add 1.5g nano-calcium carbonate, 2.0g cetyltrimethylammonium bromide (CTAB) and 99mL ethanol to a 250mL flask, add 16.5mL 27wt% ammonia water after ultrasonic dispersion for half an hour, start stirring, and control the reaction in a water bath At a temperature of 40°C, add 0.02mol ethyl orthosilicate to the above reaction system, and react for 36 hours;

[0060] (2) adding excessive dilute hydrochloric acid, removing the nano-calcium carbonate template, centrifuging to remove the supernatant and washing the obtained solid, repeating three times, to obtain hollow nano-silica A;

[0061] (3) Add 100mL of water and ethanol (V / V=1:1) and A obtained in step (2) to the three-necked flask, ultrasonically disperse for half an hour and control the reaction temperature at 30°C, add dropwise 0.04mol (CH 3 CH 2 O) 3 Si(CH 2 ) 4 NH 2 , reacted for 2 hours, centrifuged to remove the supernatant and washed the obtained solid, and repeated three times to obtain amino-modified...

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Abstract

The invention relates to a nano-sized silicon dioxide grafted organic functional polymer bisamide pesticide slow-release agent and a preparation method thereof, and defines a pesticide in any combination of one or more than one selected from the group consisting of flubendiamide, chlorantraniliprole and cyantraniliprole. The preparation method comprises the following steps: preparing hollow nano-sized silicon dioxide A, then preparing amino modified hollow nano-sized silicon dioxide B from the hollow nano-sized silicon dioxide A and an amino silane coupling agent, preparing a product C from the amino modified hollow nano-sized silicon dioxide B, water, an unsaturated monomer compound, an initiator, a catalyst and a surfactant, and preparing the nano-sized pesticide slow-release agent from the product C and the pesticide. The preparation method provided by the invention has the advantages of low cost, mild reaction conditions, less energy consumption, and no discharge of the three wastes; and the product prepared by using the preparation method provided by the invention has the advantages of high load rate, good environmental compatibility and long effective duration, solves the problem of burst release of the pesticide in some carriers, reduces the times of pesticide application, and improves the utilization rate of the pesticide.

Description

technical field [0001] The invention relates to a nano silicon dioxide grafted organic functional macromolecular bisamide insecticide sustained-release agent and a preparation method thereof, belonging to the technical field of new formulations of insecticides. Background technique [0002] In 2014, the production of chemical pesticides in my country reached 3.7 million tons, and the usage was close to 2 million tons. The long-term large-scale and low-efficiency application of pesticides (the effective utilization rate is only 10%-30%, and its loss rate is as high as 70%-90%) has caused the pesticide residues in my country's vegetables, fruits, grains, soil, and water to exceed the standard. The target organisms and human health pose a serious threat, which also leads to the destruction of the structure and function of the ecosystem. [0003] At present, the pesticide preparations produced and used in my country are mainly conventional pesticide formulations such as emulsifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/10A01N25/08A01N43/56A01P7/04
CPCA01N25/08A01N25/10A01N43/56
Inventor 何顺李建洪万虎游红高云昊张小磊廖逊
Owner HUAZHONG AGRI UNIV
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